These are implemented as a combination of two steps, mask generation and
mask expansion. Our comparision rules only return their results as a mask
register, so we need to expand the mask into lane sized elements.
We have 20 (!) comparision instructions, nearly the full table of all IntCC codes
in VV, VX and VI formats. However there are some holes in this table.
They are:
* `vmsltu.vi`
* `vmslt.vi`
* `vmsgtu.vv`
* `vmsgt.vv`
* `vmsgeu.*`
* `vmsge.*`
Most of these can be replaces with the inverted IntCC instruction, however
this commit only implements the existing instructions without any inversion
and the inverted VV versions of `sgtu`/`sgt`/`sgeu`/`sge` since we need them
to get the full icmp functionality.
I've split the actual mask expansion into it's own separate rule since we are
going to need it for the `fcmp` rules as well.
The instruction selection for `icmp` is on a separate rule simply because the
rulse end up less verbose than if they were inlined directly into the `icmp` rule.
* riscv64: Add SIMD Load+Extends
* riscv64: Add SIMD `{u,s}widen_{low,high}`
* riscv64: Add `gen_slidedown_half`
This isn't really necessary yet, but we are going to make a lot of use for it
in the widening arithmetic instructions, so might as well add it now.
* riscv64: Add multi widen SIMD instructions
* riscv64: Typo Fix
* Make wasmtime-types type check
* Make wasmtime-environ type check.
* Make wasmtime-runtime type check
* Make cranelift-wasm type check
* Make wasmtime-cranelift type check
* Make wasmtime type check
* Make wasmtime-wast type check
* Make testsuite compile
* Address Luna's comments
* Restore compatibility with effect-handlers/wasm-tools#func-ref-2
* Add function refs feature flag; support testing
* Provide function references support in helpers
- Always support Index in blocktypes
- Support Index as table type by pretending to be Func
- Etc
* Implement ref.as_non_null
* Add br_on_null
* Update Cargo.lock to use wasm-tools with peek
This will ultimately be reverted when we refer to
wasm-tools#function-references, which doesn't have peek, but does have type
annotations on CallRef
* Add call_ref
* Support typed function references in ref.null
* Implement br_on_non_null
* Remove extraneous flag; default func refs false
* Use IndirectCallToNull trap code for call_ref
* Factor common call_indirect / call_ref into a fn
* Remove copypasta clippy attribute / format
* Add a some more tests for typed table instructions
There certainly need to be many more, but this at least catches the bugs fixed
in the next commit
* Fix missing typed cases for table_grow, table_fill
* Document trap code; remove answered question
* Mark wasm-tools to wasmtime reftype infallible
* Fix reversed conditional
* Scope externref/funcref shorthands within WasmRefType
* Merge with upstream
* Make wasmtime compile again
* Fix warnings
* Remove Bot from the type algebra
* Fix table tests.
`wast::Cranelift::spec::function_references::table`
`wast::Cranelift::spec::function_references::table_pooling`
* Fix table{get,set} tests.
```
wast::Cranelift::misc::function_references::table_get
wast::Cranelift::misc::function_references::table_get_pooling
wast::Cranelift::misc::function_references::table_set
wast::Cranelift::misc::function_references::table_set_pooling
```
* Insert subtype check to fix local_get tests.
```
wast::Cranelift::spec::function_references::local_get
wast::Cranelift::spec::function_references::local_get_pooling
```
* Fix compilation of `br_on_non_null`.
The branch destinations were the other way round... :-)
Fixes the following test failures:
```
wast::Cranelift::spec::function_references::br_on_non_null
wast::Cranelift::spec::function_references::br_on_non_null_pooling
```
* Fix ref_as_non_null tests.
The test was failing due to the wrong error message being printed. As
per upstream folks' suggest we were using the trap code
`IndirectCallToNull`, but it produces an unexpected error message.
This commit reinstates the `NullReference` trap code. It produces the
expected error message. We will have to chat with the maintainers
upstream about how to handle these "test failures".
Fixes the following test failures:
```
wast::Cranelift::spec::function_references::ref_as_non_null
wast::Cranelift::spec::function_references::ref_as_non_null_pooling
```
* Fix a call_ref regression.
* Fix global tests.
Extend `is_matching_assert_invalid_error_message` to circumvent the textual error message failure.
Fixes the following test failures:
```
wast::Cranelift::spec::function_references::global
wast::Cranelift::spec::function_references::global_pooling
```
* Cargo update
* Update
* Spell out some cases in match_val
* Disgusting hack to subvert limitations of type reconstruction.
In the function `wasmtime::values::Val::ty()` attempts to reconstruct
the type of its underlying value purely based on the shape of the
value. With function references proposal this sort of reconstruction
is no longer complete as a source reference type may have been
nullable. Nullability is not inferrable by looking at the shape of the
runtime object alone.
Consequently, the runtime cannot reconstruct the type for
`Val::FuncRef` and `Val::ExternRef` by looking at their respective
shapes.
* Address workflows comments.
* null reference => null_reference for CLIF parsing compliance.
* Delete duplicate-loads-dynamic-memory-egraph (again)
* Idiomatic code change.
* Nullability subtyping + fix non-null storage check.
This commit removes the `hacky_eq` check in `func.rs`. Instead it is
replaced by a subtype check. This subtype check occurs in
`externals.rs` too.
This commit also fixes a bug. Previously, it was possible to store a
null reference into a non-null table cell. I have added to new test
cases for this bug: one for funcrefs and another for externrefs.
* Trigger unimplemented for typed function references. Format values.rs
* run cargo fmt
* Explicitly match on HeapType::Extern.
* Address cranelift-related feedback
* Remove PartialEq,Eq from ValType, RefType, HeapType.
* Pin wasmparser to a fairly recent commit.
* Run cargo fmt
* Ignore tail call tests.
* Remove garbage
* Revert changes to wasmtime public API.
* Run cargo fmt
* Get more CI passing (#19)
* Undo Cargo.lock changes
* Fix build of cranelift tests
* Implement link-time matches relation. Disable tests failing due to lack of public API support.
* Run cargo fmt
* Run cargo fmt
* Initial implementation of eager table initialization
* Tidy up eager table initialisation
* Cargo fmt
* Ignore type-equivalence test
* Replace TODOs with descriptive comments.
* Various changes found during review (#21)
* Clarify a comment
This isn't only used for null references
* Resolve a TODO in local init
Don't initialize non-nullable locals to null, instead skip
initialization entirely and wasm validation will ensure it's always
initialized in the scope where it's used.
* Clarify a comment and skipping the null check.
* Remove a stray comment
* Change representation of `WasmHeapType`
Use a `SignatureIndex` instead of a `u32` which while not 100% correct
should be more correct. This additionally renames the `Index` variant to
`TypedFunc` to leave space for future types which aren't functions to
not all go into an `Index` variant.
This required updates to Winch because `wasmtime_environ` types can no
longer be converted back to their `wasmparser` equivalents. Additionally
this means that all type translation needs to go through some form of
context to resolve indices which is now encapsulated in a `TypeConvert`
trait implemented in various locations.
* Refactor table initialization
Reduce some duplication and simplify some data structures to have a more
direct form of table initialization and a bit more graceful handling of
element-initialized tables. Additionally element-initialize tables are
now treated the same as if there's a large element segment initializing
them.
* Clean up some unrelated chagnes
* Simplify Table bindings slightly
* Remove a no-longer-needed TODO
* Add a FIXME for `SignatureIndex` in `WasmHeapType`
* Add a FIXME for panicking on exposing function-references types
* Fix a warning on nightly
* Fix tests for winch and cranelift
* Cargo fmt
* Fix arity mismatch in aarch64/abi
---------
Co-authored-by: Daniel Hillerström <daniel.hillerstrom@ed.ac.uk>
Co-authored-by: Daniel Hillerström <daniel.hillerstrom@huawei.com>
Co-authored-by: Alex Crichton <alex@alexcrichton.com>
* riscv64: Support vector instruction masking
* riscv64: Add `vmerge` instructions
* riscv64: Implement `insertlane`
* riscv64: Fix encoding of `vmv` instructions
Some of these carry their source in vs2
* riscv64: Fix formatting of mask register
Remove the space between , and the register. This
is inline with the rest of our formatting.
* riscv64: Restrict `insertlane` to vector types that fit in a single register
* wasmtime: Enable more RISC-V SIMD tests
* riscv64: Use inline format syntax for printing vector instructions
* riscv64: Add vector mask note
* delete adapter src/main.o: this was accidentally left out of #165
* move adapter, byte-array, and verify to a new workspace
* rename byte-array crate to a name available on crates.io
* add a readme for verify, also give it a slightly better name
* CI: wit dep check in its own step, verify before publish, trim down publication
* reactor-tests: delete deps symlinks
* reactor-tests: manage wit with wit-deps
* test: dont set default toolchain to nightly
* wit-deps lock adapter
* wit-deps lock reactor-tests
wit-deps doesnt manage these for some reason
Changing LLVM and/or Rust to avoid special handling of `main` is a fair
amount of work, and there could be other toolchains with similar special
rules for functions named `main`, so rename the command entrypoint back
to `run`.
We could potentially re-evaluate this in the future, such as in a
preview3 timeframe, but for now, let's go with the simplest thing that
works.
* Run some tests in MIRI on CI
This commit is an implementation of getting at least chunks of Wasmtime
to run in MIRI on CI. The full test suite is not possible to run in MIRI
because MIRI cannot run Cranelift-produced code at runtime (aka it
doesn't support JITs). Running MIRI, however, is still quite valuable if
we can manage it because it would have trivially detected
GHSA-ch89-5g45-qwc7, our most recent security advisory. The goal of this
PR is to select a subset of the test suite to execute in CI under MIRI
and boost our confidence in the copious amount of `unsafe` code in
Wasmtime's runtime.
Under MIRI's default settings, which is to use the [Stacked
Borrows][stacked] model, much of the code in `Instance` and `VMContext`
is considered invalid. Under the optional [Tree Borrows][tree] model,
however, this same code is accepted. After some [extremely helpful
discussion][discuss] on the Rust Zulip my current conclusion is that
what we're doing is not fundamentally un-sound but we need to model it
in a different way. This PR, however, uses the Tree Borrows model for
MIRI to get something onto CI sooner rather than later, and I hope to
follow this up with something that passed Stacked Borrows. Additionally
that'll hopefully make this diff smaller and easier to digest.
Given all that, the end result of this PR is to get 131 separate unit
tests executing on CI. These unit tests largely exercise the embedding
API where wasm function compilation is not involved. Some tests compile
wasm functions but don't run them, but compiling wasm through Cranelift
in MIRI is so slow that it doesn't seem worth it at this time. This does
mean that there's a pretty big hole in MIRI's test coverage, but that's
to be expected as we're a JIT compiler after all.
To get tests working in MIRI this PR uses a number of strategies:
* When platform-specific code is involved there's now `#[cfg(miri)]` for
MIRI's version. For example there's a custom-built "mmap" just for
MIRI now. Many of these are simple noops, some are `unimplemented!()`
as they shouldn't be reached, and some are slightly nontrivial
implementations such as mmaps and trap handling (for native-to-native
function calls).
* Many test modules are simply excluded via `#![cfg(not(miri))]` at the
top of the file. This excludes the entire module's worth of tests from
MIRI. Other modules have `#[cfg_attr(miri, ignore)]` annotations to
ignore tests by default on MIRI. The latter form is used in modules
where some tests work and some don't. This means that all future test
additions will need to be effectively annotated whether they work in
MIRI or not. My hope though is that there's enough precedent in the
test suite of what to do to not cause too much burden.
* A number of locations are fixed with respect to MIRI's analysis. For
example `ComponentInstance`, the component equivalent of
`wasmtime_runtime::Instance`, was actually left out from the fix for
the CVE by accident. MIRI dutifully highlighted the issues here and
I've fixed them locally. Some locations fixed for MIRI are changed to
something that looks similar but is subtly different. For example
retaining items in a `Store<T>` is now done with a Wasmtime-specific
`StoreBox<T>` type. This is because, with MIRI's analyses, moving a
`Box<T>` invalidates all pointers derived from this `Box<T>`. We don't
want these semantics, so we effectively have a custom `Box<T>` to suit
our needs in this regard.
* Some default configuration is different under MIRI. For example most
linear memories are dynamic with no guards and no space reserved for
growth. Settings such as parallel compilation are disabled. These are
applied to make MIRI "work by default" in more places ideally. Some
tests which perform N iterations of something perform fewer iterations
on MIRI to not take quite so long.
This PR is not intended to be a one-and-done-we-never-look-at-it-again
kind of thing. Instead this is intended to lay the groundwork to
continuously run MIRI in CI to catch any soundness issues. This feels,
to me, overdue given the amount of `unsafe` code inside of Wasmtime. My
hope is that over time we can figure out how to run Wasm in MIRI but
that may take quite some time. Regardless this will be adding nontrivial
maintenance work to contributors to Wasmtime. MIRI will be run on CI for
merges, MIRI will have test failures when everything else passes,
MIRI's errors will need to be deciphered by those who have probably
never run MIRI before, things like that. Despite all this to me it seems
worth the cost at this time. Just getting this running caught two
possible soundness bugs in the component implementation that could have
had a real-world impact in the future!
[stacked]: https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/stacked-borrows.md
[tree]: https://perso.crans.org/vanille/treebor/
[discuss]: https://rust-lang.zulipchat.com/#narrow/stream/269128-miri/topic/Tree.20vs.20Stacked.20Borrows.20.26.20a.20debugging.20question
* Update alignment comment
LLVM has special handling for functions named `main`, which we need to
avoid because we're creating the component-level `main` rather than the
C-level `main`. To do this, write the `main` function in assembly, which
is fortunately very simple now.
* Update the spec test suite submodule
Delete the local copies of the relaxed-simd test suite as well as
they're now incorporated.
Closes#5914
* Remove page guards in QEMU emulation
Otherwise `(memory 0 0)` was being compiled as a static memory with huge
guards which we're trying to avoid in QEMU.
* Initial support for the Relaxed SIMD proposal
This commit adds initial scaffolding and support for the Relaxed SIMD
proposal for WebAssembly. Codegen support is supported on the x64 and
AArch64 backends on this time.
The purpose of this commit is to get all the boilerplate out of the way
in terms of plumbing through a new feature, adding tests, etc. The tests
are copied from the upstream repository at this time while the
WebAssembly/testsuite repository hasn't been updated.
A summary of changes made in this commit are:
* Lowerings for all relaxed simd opcodes have been added, currently all
exhibiting deterministic behavior. This means that few lowerings are
optimal on the x86 backend, but on the AArch64 backend, for example,
all lowerings should be optimal.
* Support is added to codegen to, eventually, conditionally generate
different code based on input codegen flags. This is intended to
enable codegen to more efficient instructions on x86 by default, for
example, while still allowing embedders to force
architecture-independent semantics and behavior. One good example of
this is the `f32x4.relaxed_fmadd` instruction which when deterministic
forces the `fma` instruction, but otherwise if the backend doesn't
have support for `fma` then intermediate operations are performed
instead.
* Lowerings of `iadd_pairwise` for `i16x8` and `i32x4` were added to the
x86 backend as they're now exercised by the deterministic lowerings of
relaxed simd instructions.
* Sample codegen tests for added for x86 and aarch64 for some relaxed
simd instructions.
* Wasmtime embedder support for the relaxed-simd proposal and forcing
determinism have been added to `Config` and the CLI.
* Support has been added to the `*.wast` runtime execution for the
`(either ...)` matcher used in the relaxed-simd proposal.
* Tests for relaxed-simd are run both with a default `Engine` as well as
a "force deterministic" `Engine` to test both configurations.
* All tests from the upstream repository were copied into Wasmtime.
These tests should be deleted when WebAssembly/testsuite is updated.
* x64: Add x86-specific lowerings for relaxed simd
This commit builds on the prior commit and adds an array of `x86_*`
instructions to Cranelift which have semantics that match their
corresponding x86 equivalents. Translation for relaxed simd is then
additionally updated to conditionally generate different CLIF for
relaxed simd instructions depending on whether the target is x86 or not.
This means that for AArch64 no changes are made but for x86 most relaxed
instructions now lower to some x86-equivalent with slightly different
semantics than the "deterministic" lowering.
* Add libcall support for fma to Wasmtime
This will be required to implement the `f32x4.relaxed_madd` instruction
(and others) when an x86 host doesn't specify the `has_fma` feature.
* Ignore relaxed-simd tests on s390x and riscv64
* Enable relaxed-simd tests on s390x
* Update cranelift/codegen/meta/src/shared/instructions.rs
Co-authored-by: Andrew Brown <andrew.brown@intel.com>
* Add a FIXME from review
* Add notes about deterministic semantics
* Don't default `has_native_fma` to `true`
* Review comments and rebase fixes
---------
Co-authored-by: Andrew Brown <andrew.brown@intel.com>
* short-circuit reentrance when allocating stack and `State`
Per https://github.com/bytecodealliance/wasm-tools/pull/919,
`wit-component` needs to lazily allocate the adapter stack to avoid
premature or infinite reentrance from the main module to the adapter.
This means adding an additional `allocation_state` global variable and
using it to determine when to return early from an exported function,
e.g. because we're in the process of either allocating the stack or
allocating `State`.
This requires an updated `wit-component` dependency once
https://github.com/bytecodealliance/wasm-tools/pull/919 has been
merged.
Fixes#78
Signed-off-by: Joel Dice <joel.dice@fermyon.com>
* remove redundant unsafe blocks
Signed-off-by: Joel Dice <joel.dice@fermyon.com>
* update dependencies
This brings us up-to-date with wasi-tools, wit-bindgen, and the latest
component ABI.
Signed-off-by: Joel Dice <joel.dice@fermyon.com>
---------
Signed-off-by: Joel Dice <joel.dice@fermyon.com>
* Use a more targeted means of specifying link flags
I had forgotten earlier that this could be done with build scripts so do
that in the adapter's build script rather than as auxiliary rust flags.
* Remove `.cargo/config.toml` file
This now only serves the purpose to enable bulk-memory which is
relatively minor. This removes the file for now and wasm features can
always be reenabled at a later date if file size is truly an issue.
* Simplify global state management in adapter
I was looking recently to implement args-related syscalls but that would
require yet-more globals and yet-more state to be managed. Instead of
adding a slew of new globals for this which are all manually kept in
sync I opted to instead redesign how global state is managed in the
adapter.
The previous multiple `global`s are all removed in favor of just one, as
sort of a "tls slot" of sorts. This one remaining slot points to a
one-time-allocated `State` object which internally stores information
like buffer metadata, fd information, etc. Along the way I've also
simplified syscalls with new methods and `?`-using closures.
* Turn off incremental for dev builds
Helps with CGU splitting and ensuring that appropriate code is produced
even without `--release`.
* Review comments
* Add accessors with specific errors
* Update handling of `*_global_ptr`
* Update internal mutability around path buffer
Use an `UnsafeCell` layering to indicate that mutation may happen
through `&T`.
* feat: implement memory.atomic.notify,wait32,wait64
Added the parking_spot crate, which provides the needed registry for the
operations.
Signed-off-by: Harald Hoyer <harald@profian.com>
* fix: change trap message for HeapMisaligned
The threads spec test wants "unaligned atomic"
instead of "misaligned memory access".
Signed-off-by: Harald Hoyer <harald@profian.com>
* tests: add test for atomic wait on non-shared memory
Signed-off-by: Harald Hoyer <harald@profian.com>
* tests: add tests/spec_testsuite/proposals/threads
without pooling and reference types.
Also "shared_memory" is added to the "spectest" interface.
Signed-off-by: Harald Hoyer <harald@profian.com>
* tests: add atomics_notify.wast
checking that notify with 0 waiters returns 0 on shared and non-shared
memory.
Signed-off-by: Harald Hoyer <harald@profian.com>
* tests: add tests for atomic wait on shared memory
- return 2 - timeout for 0
- return 2 - timeout for 1000ns
- return 1 - invalid value
Signed-off-by: Harald Hoyer <harald@profian.com>
* fixup! feat: implement memory.atomic.notify,wait32,wait64
Signed-off-by: Harald Hoyer <harald@profian.com>
* fixup! feat: implement memory.atomic.notify,wait32,wait64
Signed-off-by: Harald Hoyer <harald@profian.com>
Signed-off-by: Harald Hoyer <harald@profian.com>
Implement a polyfill for `path_readlink` in terms of the preview2
`readlink_at` function.
This involves adding a second wasm global, to hold the buffer size.
* Update spec test repo
Our submodule was accidentally reverted to an older commit as part
of #4271 and while it could be updated to as it was before I went ahead
and updated it to `main`.
* Update ignore directives and test multi-memory
* Update riscv ignores
This addresses #4307.
For the static API we generate 100 arbitrary test cases at build time, each of
which includes 0-5 parameter types, a result type, and a WAT fragment containing
an imported function and an exported function. The exported function calls the
imported function, which is implemented by the host. At runtime, the fuzz test
selects a test case at random and feeds it zero or more sets of arbitrary
parameters and results, checking that values which flow host-to-guest and
guest-to-host make the transition unchanged.
The fuzz test for the dynamic API follows a similar pattern, the only difference
being that test cases are generated at runtime.
Signed-off-by: Joel Dice <joel.dice@fermyon.com>
* Re-enable component model `*.wast` tests
These accidentally stopped running as part of #4556 on CI since I forgot
one more location to touch a feature gate.
* Enable logging in component tests
This is a small convenience to get log messages during testing for
components by default.
This adds full support for all Cranelift SIMD instructions
to the s390x target. Everything is matched fully via ISLE.
In addition to adding support for many new instructions,
and the lower.isle code to match all SIMD IR patterns,
this patch also adds ABI support for vector types.
In particular, we now need to handle the fact that
vector registers 8 .. 15 are partially callee-saved,
i.e. the high parts of those registers (which correspond
to the old floating-poing registers) are callee-saved,
but the low parts are not. This is the exact same situation
that we already have on AArch64, and so this patch uses the
same solution (the is_included_in_clobbers callback).
The bulk of the changes are platform-specific, but there are
a few exceptions:
- Added ISLE extractors for the Immediate and Constant types,
to enable matching the vconst and swizzle instructions.
- Added a missing accessor for call_conv to ABISig.
- Fixed endian conversion for vector types in data_value.rs
to enable their use in runtests on the big-endian platforms.
- Enabled (nearly) all SIMD runtests on s390x. [ Two test cases
remain disabled due to vector shift count semantics, see below. ]
- Enabled all Wasmtime SIMD tests on s390x.
There are three minor issues, called out via FIXMEs below,
which should be addressed in the future, but should not be
blockers to getting this patch merged. I've opened the
following issues to track them:
- Vector shift count semantics
https://github.com/bytecodealliance/wasmtime/issues/4424
- is_included_in_clobbers vs. link register
https://github.com/bytecodealliance/wasmtime/issues/4425
- gen_constant callback
https://github.com/bytecodealliance/wasmtime/issues/4426
All tests, including all newly enabled SIMD tests, pass
on both z14 and z15 architectures.
* Initial skeleton of some component model processing
This commit is the first of what will likely be many to implement the
component model proposal in Wasmtime. This will be structured as a
series of incremental commits, most of which haven't been written yet.
My hope is to make this incremental and over time to make this easier to
review and easier to test each step in isolation.
Here much of the skeleton of how components are going to work in
Wasmtime is sketched out. This is not a complete implementation of the
component model so it's not all that useful yet, but some things you can
do are:
* Process the type section into a representation amenable for working
with in Wasmtime.
* Process the module section and register core wasm modules.
* Process the instance section for core wasm modules.
* Process core wasm module imports.
* Process core wasm instance aliasing.
* Ability to compile a component with core wasm embedded.
* Ability to instantiate a component with no imports.
* Ability to get functions from this component.
This is already starting to diverge from the previous module linking
representation where a `Component` will try to avoid unnecessary
metadata about the component and instead internally only have the bare
minimum necessary to instantiate the module. My hope is we can avoid
constructing most of the index spaces during instantiation only for it
to all ge thrown away. Additionally I'm predicting that we'll need to
see through processing where possible to know how to generate adapters
and where they are fused.
At this time you can't actually call a component's functions, and that's
the next PR that I would like to make.
* Add tests for the component model support
This commit uses the recently updated wasm-tools crates to add tests for
the component model added in the previous commit. This involved updating
the `wasmtime-wast` crate for component-model changes. Currently the
component support there is quite primitive, but enough to at least
instantiate components and verify the internals of Wasmtime are all
working correctly. Additionally some simple tests for the embedding API
have also been added.
* Remove the module linking implementation in Wasmtime
This commit removes the experimental implementation of the module
linking WebAssembly proposal from Wasmtime. The module linking is no
longer intended for core WebAssembly but is instead incorporated into
the component model now at this point. This means that very large parts
of Wasmtime's implementation of module linking are no longer applicable
and would change greatly with an implementation of the component model.
The main purpose of this is to remove Wasmtime's reliance on the support
for module-linking in `wasmparser` and tooling crates. With this
reliance removed we can move over to the `component-model` branch of
`wasmparser` and use the updated support for the component model.
Additionally given the trajectory of the component model proposal the
embedding API of Wasmtime will not look like what it looks like today
for WebAssembly. For example the core wasm `Instance` will not change
and instead a `Component` is likely to be added instead.
Some more rationale for this is in #3941, but the basic idea is that I
feel that it's not going to be viable to develop support for the
component model on a non-`main` branch of Wasmtime. Additionaly I don't
think it's viable, for the same reasons as `wasm-tools`, to support the
old module linking proposal and the new component model at the same
time.
This commit takes a moment to not only delete the existing module
linking implementation but some abstractions are also simplified. For
example module serialization is a bit simpler that there's only one
module. Additionally instantiation is much simpler since the only
initializer we have to deal with are imports and nothing else.
Closes#3941
* Fix doc link
* Update comments
This adds support for all atomic operations that were unimplemented
so far in the s390x back end:
- atomic_rmw operations xchg, nand, smin, smax, umin, umax
- $I8 and $I16 versions of atomic_rmw and atomic_cas
- little endian versions of atomic_rmw and atomic_cas
All of these have to be implemented by a compare-and-swap loop;
and for the $I8 and $I16 versions the actual atomic instruction
needs to operate on the surrounding aligned 32-bit word.
Since we cannot emit new control flow during ISLE instruction
selection, these compare-and-swap loops are emitted as a single
meta-instruction to be expanded at emit time.
However, since there is a large number of different versions of
the loop required to implement all the above operations, I've
implemented a facility to allow specifying the loop bodies
from within ISLE after all, by creating a vector of MInst
structures that will be emitted as part of the meta-instruction.
There are still restrictions, in particular instructions that
are part of the loop body may not modify any virtual register.
But even so, this approach looks preferable to doing everything
in emit.rs.
A few instructions needed in those compare-and-swap loop bodies
were added as well, in particular the RxSBG family of instructions
as well as the LOAD REVERSED in-register byte-swap instructions.
This patch also adds filetest runtests to verify the semantics
of all operations, in particular the subword and little-endian
variants (those are currently only executed on s390x).
* Update the spec reference testsuite submodule
This commit brings in recent updates to the spec test suite. Most of the
changes here were already fixed in `wasmparser` with some tweaks to
esoteric modules, but Wasmtime also gets a bug fix where where import
matching for the size of tables/memories is based on the current runtime
size of the table/memory rather than the original type of the
table/memory. This means that during type matching the actual value is
consulted for its size rather than using the minimum size listed in its
type.
* Fix now-missing directories in build script
* Support full set of ADD LOGICAL / SUBTRACT LOGICAL instructions
* Full implementation of IaddIfcout lowering
* Enable most memory64 tests (except simd and threads)
This commit removes the Lightbeam backend from Wasmtime as per [RFC 14].
This backend hasn't received maintenance in quite some time, and as [RFC
14] indicates this doesn't meet the threshold for keeping the code
in-tree, so this commit removes it.
A fast "baseline" compiler may still be added in the future. The
addition of such a backend should be in line with [RFC 14], though, with
the principles we now have for stable releases of Wasmtime. I'll close
out Lightbeam-related issues once this is merged.
[RFC 14]: https://github.com/bytecodealliance/rfcs/pull/14
Saúl Cabrera
Afonso Bordado
Luna P-C
Pat Hickey
Dan Gohman
Alex Crichton
Pat Hickey
Joel Dice
Harald Hoyer
yuyang-ok
Ulrich Weigand
Anton Kirilov
bjorn3